window.onload = () =>{
    let button = document.querySelector("button")
    button.addEventListener("click",async ()=>{
        let res = import("./demo17.js")
        res.then((module)=>{
            console.log("sum(4,25) = " + module.sum(4,25))
            console.log("X - sum(2,5)" + module.x - module.sum(2,5))
        })
    })
}